.header-navigation {
  position: fixed;
  top: 0;
  width: 100%;
  height: 60px;
  line-height: 100px;
  background-color: #000;
  text-align: center;
  z-index:10000;
}
.slideUp {
  -webkit-transform: translateY(-100px);
  transform: translateY(-100px);
  transition: transform .5s ease-out;
}
.slideDown {
  -webkit-transform: translateY(0);
  transform: translateY(0);
  transition: transform .5s ease-out;
}